Machine-gear



(No Model.)

H. P. BRADFORD 8 J. A. SMITH.

MACHINE GEAR.

' N0. 528,653. PatentedvNov. 6, 1894.

m: "cams PETERS ca. mom-0mm WASHINGTON. B. c.

UNITED STATES PATENT OFFICE.

HARRY P. BRADFORD AND JOHN A. SMITH, OF CINCINNATI, OHIO.

MACHINE-GEAR.

SPECIFICATION formingpart of Letters Patent No. 528,653, dated November6,1894. Application filed March 15, 1894. Serial No. 503,793. (Nomodel.)

T0 at whom it may concern.-

Be it known that we, HARRY P. BRADFORD and JOHN A. SMITH, citizens ofthe United States, residing at Cincinnati, Ohio, have invented new anduseful Improvements in Machine-Gears, of which the following is aspecification.

Our invention relates to gear wheels; under which term, for purposes ofthe present specification, we include wheels used in machineconstruction for giving or receiving rotating power, whether cog-wheels,band-pulleys, or friction pulleys; and its object is twofold, namely:first, to provide aconstruction in which worn or broken parts may berenewed or repaired with facility, economy and dispatch; and second, toprovide a split wheel that may, in addition to possessing the abovenamed advantages, be placed upon a shaft in position without removal ofthe latter from its hearings or connected machinery.

To these ends our invention consists, generally, first, in a wheel-rimformed in two corresponding and similarparts interlocking and adapted tobe attached to the central or hub portion of the wheel, as hereinafterpointed out; second, in the combination of said interlocking rim with ahub-portion having a face of corresponding width with the rim andrecessed' to admit opposite interlocking and fastening lugs, whereby therim parts are secured to the hub-portion and secured to each otherthrough the intervention of the disk or web of the hub-portion; andlastly, in the wheel complete, in preferred form, embodying incombination the two similar rib-portions provided with radial lugs, andthe two similar halves constituting the hub-portion; all as hereinaftermore fully set forth.

In the accompanying drawings illustrating our invention, is exhibibitedin:Figure 1, a front elevation of a spur-gear wheel complete,constructed according to our invention. Fig. 2, is a corresponding planor edge view of same. Fig. 3, is an elevation of the central orhub-portion detached. Fig. 4, is a corresponding plan or edge view ofthe same. Fig. 5, is a front elevation of one of the rim piecesdetached; and Fig. 6, is a corresponding side or edge elevation of thesame. Fig. 7, is a series of three radial sections of the completewheel, indicated as sections m, y, z,

and taken in v the planes correspondingly marked and indicated by dottedlines in Fig. 1.

We have selected for the illustration of our invention a spur-gear, suchas commonly used on geared electric street-car motors where thenecessarily compact construction of the mechanism renders a split gearnecessary, and where also the excessive wear renders frequent renewalsnecessary, thus combining both conditions illustrating specialadvantages of our invention.

The gear shown consists of two principal parts, namely: the central orhub-portion, A, made up of two similar halves, a, a and the detachablerim, B, made up in like man- 7 nor of two similar halves, b', b 9.

The hub-portion, A, consists of a circular disk or web, 10, cast with acentral hub, h, and a peripheral face or tread, t, overhanging the webat both sides. When made in two parts, as herein shown, it is cast asone and afterward broken or otherwise divided on a plane pp of thediameter. The overhanging tread, t, is connected to the hub, h, bycorresponding flanges, 0, along the line of division,

through which bolts, 0', are passed to secure the parts together. Theoverhang of the tread, t, is not continuous, but certain portions areomitted for a purpose hereinafter explained, constituting recesses, 25extending inward to the web, to. The outer face of the part, A, isslightly recessed peripherally in a central zone somewhat wider than thethickness of the web so that when the two halves, a, (L2, are boltedtogether the raised portions of the outer face may be turned to a truecy lindrical surface, still leaving a slight central depression forreasons to be hereinafter ex plained.

The rim-portion, B, is composed of two halves, b, b each consisting ofan annulus of proper dimensions to fit the central or hub-portion, A,half the width of the face or tread, t, and extending through half ormore of the entire circle, and widened mid-- way to full width for anarc-space,b ,b (Fig. 5,) equal to the omitted are between the ends, 17,6 Each rim portion is provided with four radial lugs, b b b b (b b b bprojecting inwardly in such relation that when the two portions, b, 6are placed together, the

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widened portion of one occupies the are between the extremities of theother, and the lugs stand exactly opposite in pairs, each to each,spaced apart a distance equal to the thickness of the web, to. The lugsare formed with a face width and wedge-like contour adapting themtoenter and fit the recesses, 26, when the parts are placed together,and lock the rim, B, and central or hub-portion, A, of the wheel againstinterrotation of these two main elements independently of the fastenin gbolts. The internal wall of the rim-considered as one elementis recessedsimilarly to the external periphery of the wheel portion, so that truecylindrical bearing faces may be turned on the internal wall of the rimoutside the line of the lugs, the entire surface between the turnedportions being relatively depressed. The turned surfaces are made to fitclosely the periphery of the part, A. Thus, when the parts are placedtogether, as shown in Fig. 1 and further detailed in Figs. 2 and 7,fastening bolts, e, are passed through the opposite lugs, and throughintervening web, w, and the parts thus firmly secured.

\Ve claim as our invention and desire to secure by Letters Patent of theUnited States- 1. A wheel embodying in combination a central orhub-portion, and a detachable rim composed of two equal segments eachhaving extremities of half Width and a central portion of full Width;the widened portion of one segment adapted to enter and lock between thenarrowed ends of the other segment, substantially as set forth.

2. A wheel embodying in combination a central hub-disk having a recessedoverhanging face or tread, and a detachable rim composed of two equalsegments each having a central portion of full width adapted to fit andengage between the terminals of the segment, and each provided withinner radial lugs adapted to enter the recesses of the tread orface-portion of the central disk, at opposite sides of the disk and besecured together by bolts passing through each two opposite lugs and theintervening web, substantially as set forth.

3. A split wheel embodying in combination a central hub-diskcom posed oftwo equal halves divided in an axial plane of the shaft, and adetachable rim consisting of two members each of more than half acircle, having a central portion of full width through an are equal tothat separating the ends of the opposite portion, and terminals of halfwidth substantially as set forth.

l. In a combination-wheel, the combination of a hub-disk having anoverhanging face or tread with lateral recesses or interruptions, and adetachable rim in component parts divided in a plane of rotation,provided with internal lugs adapted to enter the interruptions of thedisk-tread and be secured to the face of the web, as set forth.

In testimony whereof we have hereunto set our hands in the presence oftwo subscribing witnesses.

HARRY P. BRADFORD. JOHN A. SMITH. lVitnesses:

LANDON FREYBLER, L. M. Ilosnn.

